Move the Zynq's lwIP example from the Full demo into its own configuration as having the lwIP tasks at a high priority made the self checking test tasks report failures, while having the lwIP tasks at a low priority slugged the throughput.

git-svn-id: http://svn.code.sf.net/p/freertos/code/trunk@2253 1d2547de-c912-0410-9cb9-b8ca96c0e9e2
Reorganise Zynq project after spitting lwIP example into a separate configuration.

git-svn-id: http://svn.code.sf.net/p/freertos/code/trunk@2254 1d2547de-c912-0410-9cb9-b8ca96c0e9e2